Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C253/00—Preparation of carboxylic acid nitriles
  • C07C253/30—Preparation of carboxylic acid nitriles by reactions not involving the formation of cyano groups
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
  • B01J23/02—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the alkali- or alkaline earth metals or beryllium
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
  • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
  • B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
  • B01J23/78—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with alkali- or alkaline earth metals
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
  • C07C209/44—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of carboxylic acids or esters thereof in presence of ammonia or amines, or by reduction of nitriles, carboxylic acid amides, imines or imino-ethers
  • C07C209/48—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of carboxylic acids or esters thereof in presence of ammonia or amines, or by reduction of nitriles, carboxylic acid amides, imines or imino-ethers by reduction of nitriles

Definitions

• the present invention relates to a process for the hydrogenation of aliphatic alpha, omega-dintriles in the presence of a heterogeneous fixed bed catalyst, characterized in that the reaction mixture is 2 ⁇ mol to 30 mmol Na, K, Rb, Cs, Mg, Ca, Sr, Ba or Mn or mixtures thereof in the form of a basic salt based on 10 mol of aliphatic alpha, omega-dinitrile used.
• TSA tetrahydrazepine
• ADN adiponitrile
• ACN 6-aminocapronitrile
• HMD hexamethylene diamine
• the amount of THA increases to more than 1% by weight (based on HMD) in the suspension procedure on Raney catalysts.
• the object of the present invention was therefore to provide a process for the hydrogenation of aliphatic alpha, omega-dintriles in the presence of a heterogeneous fixed bed catalyst which does not have the disadvantages mentioned and the production of aliphatic alpha, omega-aminonitriles and / or alpha, omega Diamonds in a technically simple and economical way.
• a ls starting materials in the present process are Aliphatic alpha, omega-dinitriles of the general formula II
• n is an integer from 1 to 10, in particular 2, 3, 4, 5 and 6.
• Particularly preferred compounds I are succinonitrile, glutaronitrile, adiponitrile ("adiponitrile”), pimelonitrile and corkonitrile ("suberonitrile”), very particularly preferably adiponitrile.
• the dinitriles II described above are preferably partially converted into alpha, omega-aminonitriles of the general formula III in the presence of a solvent using a fixed bed heterogeneous catalyst
• n has the meaning given above.
• Particularly preferred aminonitriles III are those in which n has a value of 2, 3, 4, 5 or 6, in particular 4, i.e. 4-amino-butanoic acid nitrile, 5-aminopentanoic acid nitrile, 6-aminohexanoic acid nitrile ("6-amino capronitrile”), 7-amino heptanoic acid nitrile and 8-amino octane acid nitrile, very particularly preferably 6-amino capro nitrile.
• Particularly preferred diamines IV are those in which n is one
• the simultaneous production of ACN and HMD is also particularly preferred.
• the partial hydrogenation can preferably be carried out batchwise or continuously in a fixed bed reactor in a trickle or bottoms procedure, with a temperature in the range from 20 to 150, preferably from 30 to 5, 120 ° C. and a pressure generally in the range from 2 to 40, preferably from 3 to 30 MPa.
• the partial hydrogenation can advantageously be carried out in the presence of a solvent, preferably ammonia, amines, diamines and triamines having 1 to 6 carbon atoms such as trimethylamine, triethylamine, tripropylamine and tributylamine or 0 alcohol, preferably methanol and ethanol, particularly preferably ammonia carry out.
• an ammonia content in the range from 0.5 to 10, preferably from 0.5 to 6 g per g of adiponitrile is chosen.
• a catalyst loading in the range from 0.1 to 2.0, preferably from 0.3 to 1.0 kg, adiponitrile / l * h is preferably chosen.
• the molar ratio 0 of 6-aminocapronitrile to hexamethylenediamine, and thus the molar ratio of caprolactam to hexamethylenediamine, can be controlled by the adipodinitrile conversion selected in each case.
• Adiponitrile conversions are preferably carried out in the range from 10 to 90%, preferably from 30 to 80%, in order to obtain high 6-aminocapronitrile selectivities.
• the sum of 6-aminocapronitrile and hexamethylenediamine is 98 to 99%, depending on the catalyst and reaction conditions.
• the hydrogenation is carried out in such a way that the reaction mixture 2 ⁇ mol to 30 mmol, preferably 10 ⁇ mol to 3 mmol, in particular 10 ⁇ mol to 300 ⁇ mol Na, K, Rb, Cs, Mg, Ca, Sr, Ba or Mn or mixtures thereof, preferably Na, K or Ca or 5 their mixtures, in particular Ca, in the form of a basic organic, preferably inorganic salt (V), such as carbonate, preferably oxide, in particular hydroxide, or mixtures of such salts, based on 10 mol of aliphatic contains alpha, omega-dinitrile.
• V basic organic, preferably inorganic salt
• a salt (V) which is completely soluble in the reaction mixture is particularly preferred.
• a salt (V) can be added to the reaction mixture before the hydrogenation, preferably in solid form in at least one of the constituents of the reaction mixture or the reaction mixture. It is also possible to add the reaction mixture during the add a salt (V), the beneficial effect compared to an addition before the hydrogenation is less.
• the hydrogenation can be carried out per se according to one of the known processes by generally carrying out the hydrogenation in the presence of catalysts containing nickel, cobalt, iron or rhodium.
• the catalysts can be used as supported catalysts or as unsupported catalysts.
• aluminum oxide, silicon dioxide, titanium dioxide, magnesium oxide, activated carbon and spinels are suitable as catalyst supports.
• the dinitrile is hydrogenated at elevated temperature and pressure in the presence of a solvent and a fixed bed heterogeneous catalyst using a catalyst which
• component (a) if a compound based only on ruthenium or rhodium or ruthenium and rhodium or nickel and rhodium is selected as component (a), the promoter (b) can be omitted if desired, and with the further proviso that component (a) is not iron-based when component (b) is aluminum.
• Preferred catalysts are those in which component (a) has at least one compound based on a metal, selected from the group consisting of nickel, cobalt and iron, in an amount in the range from 10 to 95% by weight, and also ruthenium and / or Contains rhodium in an amount in the range from 0.1 to 5% by weight, based in each case on the sum of components (a) to (c), component (b) at least one promoter based on a metal, selected from the group consisting of silver, copper, manganese, rhenium, lead and phosphorus, in an amount in the range from 0.1 to 5% by weight, based on (a), contains, and
• component (c) contains at least one compound based on the alkali metals and alkaline earth metals, selected from the group consisting of lithium, sodium, potassium, cesium, magnesium and calcium, in an amount in the range from 0.1 to 5% by weight .
• Particularly preferred catalysts are:
• Catalyst A containing 90% by weight of cobalt oxide (CoO), 5% by weight of manganese oxide (Mn 2 0 3 ), 3% by weight of phosphorus pentoxide and 2% by weight of sodium oxide (Na 2 0),
• Catalyst B containing 20% by weight of cobalt oxide (CoO), 5% by weight of manganese oxide (Mn 2 0 3 ), 0.3% by weight of silver oxide (Ag 2 0), 70% by weight of silicon dioxide (Si0 2 ), 3.5% by weight of aluminum oxide (A10 3 ), 0.4% by weight of iron oxide (Fe 2 0 3 ), 0.4% by weight of magnesium oxide (MgO) and 0.4% by weight of calcium oxide (CaO), and
• Catalyst C containing 20% by weight of nickel oxide (NiO), 67.42% by weight of silicon dioxide (Si0), 3.7% by weight of aluminum oxide (A10 3 ), 0.8% by weight of iron oxide (Fe 2 0), 0.76% by weight magnesium oxide (MgO),
• CaO calcium oxide
• Na 0 sodium oxide
• K 2 0 potassium oxide
• the dinitrile is hydrogenated at elevated temperature and pressure in the presence of a solvent and a heterogeneous fixed bed catalyst
• catalysts 0 to 1% by weight, based on the sum of (a) and (b), a compound based on an alkali metal, alkaline earth metal or zinc.
• Preferred catalysts are those whose proportion in the catalyst precursor before activation with hydrogen or a gas mixture which contains hydrogen and an inert gas such as nitrogen, in one or more co-compounds, calculated as cobalt-II-oxide, 10 to 80% by weight, preferably 20 to 70% by weight, in particular 30 to 60% by weight.
• Preferred catalysts are those whose proportion in the catalyst precursor before activation with hydrogen or a gas mixture which contains hydrogen and an inert gas such as nitrogen, in one or more Fe compounds, calculated as iron III oxide, 20 to 90% by weight, preferably 30 to 80% by weight, in particular 40 to 70% by weight.
• Suitable carrier materials are, for example, porous oxides such as aluminum oxide, silicon dioxide, aluminosilicates, lanthanum oxide, titanium dioxide, zirconium dioxide, magnesium oxide, zinc oxide and zeolites, and activated carbon or mixtures thereof.
• the preparation is usually carried out in such a way that one or more precursors of component (a) together with precursors of component (b) and, if desired, with one or more precursors of trace component (c) in the presence or absence of carrier materials (depending on which type of catalyst is desired) fails, if desired the catalyst precursor thus obtained is processed into strands or tablets, dried and then calcined.
• Supported catalysts are generally also obtainable by impregnating the support with a solution of components (a), (b) and, if desired (c), it being possible to add the individual components simultaneously or in succession, or by adding components (a), (b) and if desired (c) - sprayed onto the carrier by methods known per se.
• Suitable precursors of components (a) and (b) are generally readily water-soluble salts of the aforementioned metals, such as nitrates, chlorides, acetates, formates and sulfates, preferably nitrates.
• the precursors to component (c) are generally readily water-soluble salts of the alkali metals or alkaline earth metals, such as lithium, sodium, potassium, rubidium, cesium, magnesium or calcium, or zinc and mixtures thereof, such as hydroxides, C arbonate, nitrates, chlorides, acetates, formates and sulfates
• the precipitation is generally carried out from aqueous solutions, selectively by adding precipitation reagents, by changing the pH or by changing the temperature.
• ammonium carbonate or hydroxides or carbonates of the alkali metals can be used as precipitation reagents.
• alkali metal compounds, reagents used it is recommended that the precipitation-free, for example by washing with water from adhering alkali metal compounds to be ⁇ . This can be done immediately after the precipitation has been separated from the mother liquor or after a drying and calcining step. Drying can be carried out in a manner known per se, preferably in spray towers, the precipitate generally being suspended in a liquid, advantageously water.
• the catalyst mass thus obtained is usually dried in general at temperatures in the
• 20 range from 80 to 150 ° C, preferably from 80 to 120 ° C before.
• the calcination is usually carried out at temperatures in the range from 150 to 500.degree. C., and in individual cases temperatures of up to 1,000.degree. C. can also be considered, preferably 200 to 25,450.degree. C. in a gas stream from air or nitrogen in a suitable stream Apparatus such as tray or rotary kilns.
• the powder can, in particular in the event that the catalyst mass is to be used in a fixed bed, be processed into shaped bodies, such as strands or tablets, in a manner known per se.
• auxiliaries such as inorganic acids, organic acids or bases such as ammonia can be added
• the auxiliaries can contain cobalt or iron compounds.
• the strands can be dried at temperatures below 200 ° C. and at temperatures in the range from 150 to 500 ° C., in individual cases temperatures of up to 1000 ° C. may also be considered, preferably 200 to 450 ° C. in
• Organic or inorganic auxiliaries such as stearates, graphite or talc can be added to tablets.
• the catalyst mass is exposed to a reducing atmosphere (“activation”) by, for example, at a temperature in the range from 150 to 300 ° C., preferably from 200 to 280 ° C., for 2 to 96 hours in a hydrogen atmosphere or a gas mixture containing hydrogen and an inert gas such as nitrogen, with a catalyst load of 200 to 2000 liters per 1 catalyst per hour.
• a reducing atmosphere activation
• the activation of the catalyst is advantageously carried out directly in the synthesis reactor, since this usually results in an intermediate step which is otherwise required, namely the passivation of the surface at usually temperatures in the range from 20 to 80, preferably from 25 to 35 ° C. by means of oxygen-nitrogen mixture - like air, falls away.
• the activation of passivated catalysts is then preferably carried out in the synthesis reactor at a temperature in the range from 150 to 300, preferably from 200 to 280 ° C. in a hydrogen-containing atmosphere.
• the catalysts contain
• (c) 0 to 1% by weight, based on the sum of (a) and (b), a compound based on an alkali metal, alkaline earth metal or zinc.
• the catalysts can be used as fixed bed catalysts in the bottom or trickle mode.
• catalysts are those which are selected from the same
• a) contain a compound based on iron such as iron oxide and b) from 0 to 5% by weight based on (a) a promoter based on one element or 2, 3, 4 or 5 elements selected from the group consisting of aluminum, silicon, zirconium, vanadium and titanium and
• a compound based on an alkali or alkaline earth metal preferably selected from the group consisting of lithium, sodium, potassium, rubidium, cesium, magnesium and calcium.
• the preferred catalysts can be unsupported or supported catalysts.
• Suitable carrier materials are, for example, porous oxides such as aluminum oxide, silicon dioxide, aluminum silicates, lanthanum oxide, titanium dioxide, zirconium dioxide, magnesium oxide, zinc oxide and zeolites, and activated carbon or mixtures thereof.
• the preparation is usually carried out by precursors of components (a) together with precursors of the promoters
• Components (b) and, if desired, with precursors of trace components (c) in the presence or absence of support materials (depending on which type of catalyst is desired) fails, if desired processing the catalyst precursor obtained in this way into strands or tablets, drying and then calcining.
• Supported catalysts are generally also available by impregnating the carrier with a solution of components (a), (b) and, if desired (c), it being possible to add the individual components simultaneously or in succession, or by adding components (a), (b) and if desired (c) sprayed onto the carrier by methods known per se.
• Suitable precursors of component (a) are generally readily water-soluble salts of the aforementioned metals, such as nitrates, chlorides, acetates, formates and sulfates, preferably nitrates.
• Suitable precursors of components (b) are generally readily water-soluble salts or complex salts of the aforementioned metals such as nitrates, chlorides, acetates, formates and sulfates, and in particular hexachloroplatinate, preferably nitrates and hexachloroplatinate.
• the precursors to components (c) are generally readily water-soluble salts of the abovementioned alkali metals and alkaline earth metals, such as hydroxides, carbonates, nitrates, chlorides, acetates, Formates and sulfates, preferably hydroxides and carbonates.
• the precipitation is generally carried out from aqueous solutions, optionally by adding precipitation reagents, by changing the pH or by changing the temperature.
• the catalyst pre-mass obtained in this way is generally pre-dried at temperatures in the range from 80 to 150 ° C., preferably from 80 to 120 ° C.
• the calcination is usually carried out at temperatures in the range from 150 to 500, preferably from 200 to 450 ° C. in a gas stream from air or nitrogen.
• the catalyst mass obtained is generally subjected to a reducing atmosphere (“activation”), for example by being at a temperature in the range from 80 to 250, preferably from 80 to 180 ° C. in the case of catalysts based on ruthenium or rhodium as component (a), or in the range from 200 to 500, preferably from 250 to 400 ° C. in the case of catalysts based on one of the metals selected from the group consisting of nickel, cobalt and iron as component (a) for 2 to 24 hours of hydrogen -Exposed to atmosphere or a gas mixture containing hydrogen and an inert gas such as nitrogen.
• activation a reducing atmosphere
• the catalyst load is preferably 200 l per 1 catalyst.
• the activation of the catalyst is advantageously carried out directly in the synthesis reactor, since this usually results in an intermediate step which is otherwise required, namely the passivation of the surface at usually temperatures in the range from 20 to 80, preferably from 25 to 35 ° C. by means of oxygen-nitrogen mixture - like air, falls away.
• the activation of passivated catalysts is then preferably carried out in a synthesis reactor at a temperature in the range from 180 to 500, preferably from 200 to 350 ° C. in a hydrogen-containing atmosphere.
• the catalysts can be used as fixed bed catalysts in the bottom or trickle mode.
• the process according to the invention gives alpha, omega-aminonitriles and / or alpha, omega diamines in good selectivities and with only small amounts of undesired by-products.
• Alpha, omega-aminonitriles and alpha, omega diamines are important starting compounds for the production of cyclic Lactams, especially 6-aminocapronitrile for caprolactam and HMD.
• the catalysts were prepared by annealing a magnetite ore at 1500 ° C under nitrogen for 6 hours.
• the magnetite ore used had the following composition:
• the cooled melting block was crushed in a jaw crusher and a sieve fraction of particle size 3-6 mm was sieved out.
• the oxidic catalyst was reduced in a hydrogen / nitrogen stream at 450 ° C. for 72 h and then passi vated in a nitrogen / air stream (24 h with 1% by volume air in nitrogen) at below 45 ° C.
• a tubular reactor (length 180 cm, diameter 30 mm) was filled with 740 ml (1816 g) of the catalyst mass prepared according to (a) and reduced at 150 bar in a stream of hydrogen (500 Nl / h). The temperature was raised from 30 ° C to 340 ° C within 24 h and then held at 340 ° C for 72 h.
• the THA content based on HMD in the hydrogenation was 1200 ppm. example 1
• the THA content based on HMD in the hydrogenation was 400 ppm.
• the THA content based on HMD in the hydrogenation was 300 ppm.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Catalysts (AREA)
• Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (2)

Family

ID=7859987

Family Applications (1)

Country Status (15)

Cited By (1)

Families Citing this family (19)

Citations (5)

• 1998
  • 1998-03-06 DE DE19809686A patent/DE19809686A1/de not_active Withdrawn
• 1999
  • 1999-02-23 CN CNB998037230A patent/CN1198788C/zh not_active Expired - Fee Related
  • 1999-02-23 AU AU34086/99A patent/AU3408699A/en not_active Abandoned
  • 1999-02-23 KR KR1020007009827A patent/KR20010041628A/ko active IP Right Grant
  • 1999-02-23 CA CA002322530A patent/CA2322530A1/en not_active Abandoned
  • 1999-02-23 BR BR9908504-6A patent/BR9908504A/pt not_active IP Right Cessation
  • 1999-02-23 ES ES99915533T patent/ES2190648T3/es not_active Expired - Lifetime
  • 1999-02-23 ID IDW20001718A patent/ID26184A/id unknown
  • 1999-02-23 US US09/622,800 patent/US6265602B1/en not_active Expired - Fee Related
  • 1999-02-23 EP EP99915533A patent/EP1058677B1/de not_active Expired - Lifetime
  • 1999-02-23 JP JP2000534527A patent/JP2002505315A/ja not_active Withdrawn
  • 1999-02-23 DE DE59903972T patent/DE59903972D1/de not_active Expired - Lifetime
  • 1999-02-23 WO PCT/EP1999/001149 patent/WO1999044982A2/de active IP Right Grant
  • 1999-03-04 MY MYPI99000792A patent/MY133822A/en unknown
  • 1999-03-05 TW TW088103427A patent/TW584620B/zh not_active IP Right Cessation
  • 1999-03-05 AR ARP990100942A patent/AR015535A1/es unknown

Patent Citations (5)

Also Published As

Similar Documents

Legal Events